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UID:69da14b9a50a3
DTSTAMP:20260411T053033
DTSTART:20181126T113000
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DTEND:20181126T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/841282-the-vibrationa
 l-modes-of-matter-matteo-baggioli-university-of-crete
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:The vibrational modes of matter - Matteo Baggioli (University of Cr
 ete)
DESCRIPTION:The vibrational modes of matterMatteo BaggioliInstituto de Fisi
 ca TeoricaUAM-CISC\, Madrid\, Spain
\n 
\nAbstract: In the first part of 
 the talk a theoretical description of the vibrational density of states (V
 DOS) of solids (both crystals and glasses) is presented starting from firs
 t principles. Without using any assumptions whatsoever about the existence
  and nature of 'disorder' in the material\, it is shown analytically that 
 the boson peak in the VDOS of both ordered crystals and glasses arises nat
 urally from the competition between elastic mode propagation and viscous d
 amping. The theory explains the recent experimental observations of boson 
 peak in perfectly ordered crystals which cannot be explained based on prev
 ious theoretical frameworks. The theory also explains\, for the first time
 \, how the vibrational spectrum changes with the atomic density of the sol
 id\, and explains recent experimental observations of this effect.
\n 
\n
 In the second part\, we will discuss the theoretical challenges introduced
  by the recent observation of low frequency solid-like elastic response in
  liquids. We will propose and motivate a possible resolution of the puzzle
  based on the so-called k-gap dispersion relation\, providing a universal 
 framework to understand the vibrational modes in both solids and liquids.

 \n 
\nWeb page of the Instituto de Fisica Teorica IFT Madrid
\n 
\nCette
  conférence est présentée par le RQMP Versant Nord du Département d
 e physique de l'Université de Montréal et de Génie physique de la Po
 lytechnique.
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